slotted spring pins

SLOTTED SPRING PINS
ISO 8752
ASME B18.8.2
ASME B18.8.4M
1
SLOTTED SPRING PINS
SPIROL® Slotted Spring Pins manufactured to
ISO 8752 (EN 28752), ASME B18.8.4M Type B (Metric),
and ASME B18.8.2 (Inch) are available from stock.
• DIN 1481 is interchangeable with ISO 8752 (EN 28752) except for a variation in
length tolerance.
• The ASME B18.8.2 range meets the requirements of most pins per NASM 10971
(formerly MIL-P-10971), NASM 16562 (formerly 16562), NAS 561, SAE J496, and
SAE AS7207 (Superseded AMS 7207 and MS171401-MS171900).
• ISO 13337 (DIN 7346), lightweight Slotted Pins, are available made-to-order for
volume applications.
ISO/TS 16949:2009 and ISO 9001:2008 certifications are your guarantee
for consistent quality.
 Contract Review / Quality Planning. A formal procedure
exists for the specification and acceptance of new orders by
sales, manufacturing and quality.
 Document / Drawing Control. All drawings, standards and
specifications are controlled through engineering.
 SQA Approval of Suppliers and Subcontractors is
maintained by supplier system audits and monitoring of
supplier quality performance.
 System Audits are carried out regularly by independent
auditors with written reports submitted for management
action.
 Calibration and Gauge Control. All gauges are calibrated
on a regular basis, traceable back to national standards. The
control records are computerized.
PART DESCRIPTION
 All parts are traceable through each manufacturing process
and heat treatment back to the original raw material test
certificate. Each lot has a unique identification number on
the packaging which should be retained by the customer and
quoted in the event of any inquiry.
 Manufacturing Controls. There is clear identification of job
and quality status with controlled routings. Capability studies
are used to verify machine and process capability; statistical
process control is used for all processes, using variable and
attribute data; and there are final audit checks of completed
parts and stock.
 Non-Conforming Parts. These are segregated with a “hold”
label and quarantined pending a decision on disposal. An
automated corrective action system ensures management
control for quick and accurate responses to customer
inquiries.
MATERIALS*
SLTP 4 X 10 BK ISO 8752
High Carbon Steel
AISI 1070, ISO C67S
Standard
Finish
Material
Length
Diameter
Pin Type (Slotted)
Martensitic (Chrome) Stainless Steel
AISI 420, ISO X30Cr13 (1.4028)
Austenitic (Nickel) Stainless Steel
AISI 302, ISO X10CrNi18-8 (1.4310)
* All standard materials conform to that as specified
in ISO 8752, ASME B18.8.2 and ASME B18.8.4M
Type B.
2
THE CHOICE – ASME OR ISO
SPIROL produces Slotted Pins to both the American National Standard, ASME B18.8.4M, and the International
Standard, ISO 8752 (EN 28752). It is our recommendation that you consider ASME pins for all new applications and
for your current applications if you are experiencing insertion problems or performance failures. Our recommendation
is based on these important advantages of ASME pins:

LOWER INSERTION FORCE as a result of the smaller free diameter of the pin in relation to the nominal hole. The pin
is securely retained in the hole based on increased wall thickness, higher minimum hardness, and the minimal slot after
insertion.

NO INTERLOCKING because the maximum gap in the free diameter state is always less than the wall thickness of the pin.

HIGHER SHEAR STRENGTH based on increased wall thickness, a higher minimum hardness, and narrower slots which
close under load to ensure that the pins fail instantaneously rather than progressively in shear.
SHEAR STRENGTH COMPARISON
Nom. Dia.
1.5
2
2.5
3
4
5
6
8
10
12
14
16
18
20
ISO kN
1.58
2.82
4.38
6.32
11.24
17.54
26.04
42.76
70.16
104.1
144.7
171.0
222.5
280.6
ASME kN
1.8
3.5
5.5
7.8
12.3
19.6
28.5
48.8
79.1
111.6*
170.0
190.0
250.0
320.0
Increase %
+11.4
+12.4
+12.6
+12.4
+9.4
+11.2
+9.4
+11.4
+12.6
+7.2
+17.5
+11.1
+12.4
+11.4
* SPIROL standard.
COMPARISON OF RECOMMENDED HOLES
ASME recommends tolerance class
H10 for holes up to 2.5 mm and H12
for diameters 3 mm and larger. ISO
recommends H12 for all diameters.
Nom. Dia.
ISO
ASME
1.5
2
2.5
3 and up
1.5 / 1.6
2 / 2.1
No difference
1.5 / 1.56
2 / 2.07
2.5 / 2.58
No difference
ASME pins 3 mm and larger can
be substituted for ISO pins without
any review or change. 1.5 to 2.5
mm pins require a change in the
maximum specified hole.
COMPARISON OF TECHNICAL SPECIFICATIONS
EXPANDED DIAMETER – ASME pins have a smaller expanded
or free diameter relative to the nominal hole.
CHAMFER SPECIFICATION – ASME specifies a maximum
chamfer diameter from 0.1 to 0.5 mm smaller than the nominal
hole diameter whereas ISO only specifies a chamfer diameter
less than the nominal hole diameter.
STRAIGHTNESS – ASME specifies a straightness requirement.
ISO does not address it at all.
SHEAR STRENGTH – ASME specifies a minimum double
shear strength for austenitic stainless steel. ISO does not.
MATERIAL – ASME includes Beryllium Copper. ISO does not.
LENGTH TOLERANCE – The differences are minimal:
Pin Length
ISO
ASME
4 - 10 mm
12 - 24 mm
26 - 50 mm
55 -75 mm
80 - 100 mm
± 0.25 mm
± 0.50 mm
± 0.50 mm
± 0.75 mm
± 0.75 mm
± 0.40 mm
± 0.40 mm
± 0.50 mm
± 0.60 mm
± 0.75 mm
WALL THICKNESS – ASME pins have a wall thickness equal
to or greater than ISO pins and a greater cross sectional area
based on both thickness and strip width.
HARDNESS – The ASME specification for carbon steel is
higher (HV 458-560 vs HV 420-520) to maximize the tensile
strength and for chrome stainless it is slightly lower
(HV 423-544 vs HV 440-560) to avoid the risk of brittleness.
1
ISO 8752
EN 28752
PIN MATERIALS AND HARDNESS
B Carbon Steel
HV 420-520
C Martensitic Stainless Steel HV 440-560
D Austenitic Stainless Steel Work Hardened
PIN FINISHES
K Plain*
* Plain carbon steel pins have a protective oil finish.
B IS LESS THAN NOMINAL PIN DIAMETER
SPECIFICATIONS in mm
Pin Diameter
Nominal
Pin
Diameter
Min.1
1.7
2.3
2.8
3.3
3.8
4.4
4.9
5.4
6.4
8.5
10.5
12.5
14.5
16.5
18.5
20.5
1.5
2
2.5
3
3.5
4
4.5*
5
6
8
10
12
14*
16*
18*
20*
1
Chamfer Length Wall Thickness
D
Max.2
1.8
2.4
2.9
3.5
4.0
4.6
5.1
5.6
6.7
8.8
10.8
12.8
14.8
16.8
18.9
20.9
Minimum diameter is the average of D1, D2, and D3.
C
S
Nominal
0.25
0.35
0.40
0.50
0.60
0.65
0.80
0.90
1.20
2.00
2.00
2.00
2.00
2.00
2.00
3.00
Nominal
0.3
0.4
0.5
0.6
0.75
0.8
1.0
1.0
1.2
1.5
2.0
2.5
3.0
3.0
3.5
4.0
2
Recommended
Hole Size
Min.
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
6.0
8.0
10.0
12.0
14.0
16.0
18.0
20.0
Maximum measured with go-ring gauge.
Double Shear Strength
Carbon & Martensitic S.S.
Max.
1.60
2.10
2.60
3.10
3.62
4.12
4.62
5.12
6.12
8.15
10.15
12.18
14.18
16.18
18.18
20.21
3
Minimum kN
1.58
2.82
4.38
6.32
9.09
11.24
15.36
17.54
26.04
42.76
70.16
104.1
144.7 3
171.0 3
222.5 3
280.6 3
Carbon Steel only.
STANDARD LENGTHS
2
Length
4
5
6
8
10
12
14
16
18
20
22
24
26
28
30
32
35
40
45
50
55
60
65
70
75
80
85
90
95
100
1.5
2
2.5
3
3.5
4
Nominal Diameter
4.5*
5
6
Nominal Pin Length Length Tolerance
Length Tolerance — ISO 8752
4 to 10 mm 12 to 50 mm 55 to 100 mm ± 0.25 mm
± 0.50 mm
± 0.75 mm
Length Tolerance — DIN 1481 (Ref.)
4 to 10 mm 12 to 50 mm 55 to 100 mm + 0.5 mm
+ 1.0 mm
+ 1.5 mm
* Generally not a stocked item. Subject to minimum purchase quantities.
8
10
12
14*
16*
18*
20*
ASME B18.8.4M
TYPE B
PIN MATERIALS AND HARDNESS
B Carbon Steel
HV 458-560
C Martensitic Stainless Steel HV 423-544
D Austenitic Stainless Steel Work Hardened
PIN FINISHES
K Plain*
T Mechanical Zinc Plated
* Plain carbon steel pins have a protective oil finish.
SPECIFICATIONS in mm
Pin Diameter
Nominal
Pin
Diameter
1.5
2
2.5
3
4
5
6
8
10
12
14†*
16†*
18†*
20†*
1
D
Min.1
1.58
2.10
2.62
3.14
4.16
5.17
6.18
8.22
10.25
12.28
14.30
16.32
18.35
20.40
Chamfer
Length
Chamfer
Diameter
B
Max.2
1.66
2.19
2.72
3.25
4.30
5.33
6.36
8.45
10.51
12.55
14.60
16.65
18.71
20.80
Wall
Thickness
C
Max.
1.4
1.9
2.4
2.9
3.9
4.8
5.8
7.8
9.7
11.7
13.7
15.6
17.6
19.5
Min.
0.15
0.2
0.2
0.2
0.3
0.3
0.4
0.4
0.5
0.6
0.8
1.0
1.2
1.4
S
Nominal
0.35
0.45
0.55
0.65
0.8
1.0
1.2
1.6
2.0
2.5
3.0
3.0
3.5
4.0
Max.
0.7
0.8
0.9
1.0
1.2
1.4
1.6
2.0
2.4
2.8
2.8
3.0
3.2
3.4
Minimum diameter is the average of D1, D2, and D3.
2
Minimum Double Shear Strength
Recommended
Hole Size
Min.
1.5
2.0
2.5
3.0
4.0
5.0
6.0
8.0
10.0
12.0
14.0
16.0
18.0
20.0
Carbon &
Martensitic S.S.
Max.
1.56
2.07
2.58
3.10
4.12
5.12
6.12
8.15
10.15
12.18
14.18
16.18
18.18
20.21
Maximum measured with go-ring gauge.
kN
1.8
3.5
5.5
7.8
12.3
19.6
28.5
48.8
79.1
111.6 3
170.0 4
190.0 4
250.0 4
320.0 4
3
Austenitic
S.S.
SPIROL standard.
4
1.0
2.0
3.2
4.5
7.2
11.4
16.6
28.4
46.1
60.7
—
—
—
—
Carbon Steel only.
STANDARD METRIC SIZES
Length
4
5
6
8
10
12
14
16
18
20
22
24
26
28
30
32
35
40
45
50
55
60
65
70
75
80
85
90
95
100
1.5
2
2.5
3
4
5
Nominal Diameter
6
8
10
12
14†*
16†*
18†*
20†*
Nominal Pin Length Length Tolerance
Up to 24 mm, incl.
Over 24 to 50 mm
Over 50 to 75 mm
Over 75 mm
±0.40 mm
±0.50 mm
±0.60 mm
±0.75 mm
† In conformance with but not part of ASME 18.18.4M.
* Generally not a stocked item. Subject to minimum purchase quantities.
3
ASME B18.8.2
PIN MATERIALS AND HARDNESS
PIN FINISHES
B Carbon Steel
HV 458-560
C Martensitic Stainless Steel HV 423-544
D Austenitic Stainless Steel Work Hardened
K Plain*
T Mechanical Zinc Plated
* Plain carbon steel pins have a protective oil finish.
SPECIFICATIONS in inches
Pin Diameter
Nominal
Pin
Diameter
1/16
5/64
3/32
1/8
5/32
3/16
7/32
1/4
5/16
3/8
7/16
1/2
5/8 3
3/4 3
1
.062
.078
.094
.125
.156
.187
.219
.250
.312
.375
.437
.500
.625
.750
1
Min.
.066
.083
.099
.131
.162
.194
.226
.258
.321
.385
.448
.513
.640
.768
D
Max.
.069
.086
.103
.135
.167
.199
.232
.264
.330
.395
.459
.524
.653
.784
2
Chamfer
Diameter
B
Max.
.059
.075
.091
.122
.151
.182
.214
.245
.306
.368
.430
.485
.608
.730
Chamfer
Length
Min.
.007
.008
.008
.008
.010
.011
.011
.012
.014
.016
.017
.025
.030
.045
Minimum diameter is average of D1, D2 and D3.
C
2
Max.
.028
.032
.038
.044
.048
.055
.065
.065
.080
.095
.095
.110
.125
.150
Minimum Double Shear Strength
Recommended
Wall
Hole Size
Thickness
S
Nom.
.012
.018
.022
.028
.032
.040
.048
.048
.062
.077
.077
.094
.118
.145
Min.
.062
.078
.094
.125
.156
.187
.219
.250
.312
.375
.437
.500
.625
.750
Max.
.065
.081
.097
.129
.160
.192
.224
.256
.318
.382
.445
.510
.637
.764
Carbon &
Martensitic S.S.
Lbs.
kN
430
2.00
800
3.56
1150
5.12
1875
8.34
2750
12.23
4150
18.46
5850
26.02
7050
31.36
10800
48.04
16300
72.50
19800
88.08
27100
120.55
42500
189.06
62500
278.02
Maximum diameter measured with go-ring gauge.
3
Austenitic S.S.
Lbs.
250
460
670
1090
1600
2425
3400
4100
6300
9500
11500
15800
—
—
kN
1.10
2.05
2.98
4.85
7.12
10.79
15.12
18.24
28.02
42.25
51.16
70.28
—
—
SPIROL standards, Carbon Steel only.
STANDARD SIZES
Length
4
3/16
1/4
5/16
3/8
7/16
1/2
9/16
5/8
11/16
3/4
13/16
7/8
15/16
1
1-1/8
1-1/4
1-3/8
1-1/2
1-5/8
1-3/4
1-7/8
2
2-1/4
2-1/2
2-3/4
3
3-1/4
3-1/2
3-3/4
4
1/16
5/64
3/32
1/8
5/32
3/16
Nominal Diameter
7/32
1/4
5/16
Nominal Length
Pin Length
Tolerance
Up to 1”, incl. ±0.015
Over 1” to 2”, incl.
±0.020
Over 2” to 3”, incl.
±0.025
Over 3” to 4”, incl.
±0.030
Over 4”
±0.035
* Generally not a stocked item. Subject to minimum purchase quantities.
3/8
7/16
1/2
5/8*
3/4*
TECHNICAL INFORMATION
SHEAR STRENGTH
The shear test procedure is set forth in ISO 8749, ASME B18.8.2,
ASME B18.8.4M, SAE J496, and NASM 10971, which are identical
in substance.
Load
Shear block
Load
Hardened shear
block
Slotted
Pin*
Spacer
In situations requiring exceptionally high shear strength, it is
possible to use pins in combination by driving an inner pin
into an already inserted outer pin. The gaps should be 180°
opposed. The recommended hole needs to be increased.
It is suggested you consult SPIROL Application Specialists
in these situations.
WHICH STAINLESS?
Hardened support
block
Cap Screws
Spacer and guides
for shear block
The recommended maximum ratio is 1 to 3; that is the pin
diameter should never exceed 33.3% of the shaft diameter.
If this limit is exceeded, the remaining material in the shaft
is inadequate and the shaft will fail before the pin.
DOUBLE PINNING
Hardened
bushings
Support
Fixture
RECOMMENDED PIN/SHAFT RATIO
*Orientation during testing is specification dependant.
Typical pin shear test fixture
Shear values specified will only be obtained under the conditions
noted in the referenced standards. Of special note:
¥ The clearance at the shear plane cannot exceed
0.15 mm or .005”.
¥ The hole has to be the nominal pin diameter (tolerance H6)
with a hardness of not less than HV 700.
¥ The shear planes have to be at least one pin diameter from
each end, and at least two diameters apart.
¥ ISO 8752 pins are shear tested with the slot up, aligned with
the shear load.
¥ ASME B18.8.2, ASME B18.8.4M, NASM 10971, and SAE
J496 pins are shear tested with the slot rotated 90˚ to the
shear load.
STRAIGHTNESS SPECIFICATION
(ASME PINS ONLY) The straightness over the length of the pins
shall be such that the pin will pass freely through a ring gauge of
the length and diameter as specified below.
Martensitic chrome stainless steel is hardened and has
strength comparable to carbon steel. It also provides
satisfactory corrosion resistance in most cases. Austenitic
nickel stainless steel has better corrosion resistance in
some environments but since it is not hardened, it has
lower strength and requires more care in the insertion
process.
HOLE PREPARATION
Holes can be drilled, punched or cast with no need for
additional reaming or sizing. Care should be taken to avoid
undersize holes to eliminate potential pin damage during
insertion. The following points are suggested for your
consideration:

Break or debur the edges, particularly in case of
hardened holes.

Countersinking is not recommended if it increases the
clearance at the shear plane.

In case of cast or sintered metal holes, provide a leadin radius.

Whenever possible, punched holes should be punched
in the same direction as the direction of pin insertion.

Eliminate hole misalignment problems by drilling holes
together.

In case of hardened collars or similar components,
flatten the component at the entry of the hole to avoid
two-point contact as the pin starts into the hole.
STRAIGHTNESS GAUGE SPECIFICATIONS
Pin Length
Gauge Length
Up to 24 mm
Up to 1”
24 mm – 50 mm
1” – 2”
Over 50 mm
Over 2”
25 ± 0.15
1” ± .005”
50 ± 0.15
2” ± .005”
75 ± 0.15
3” ± .005”
Maximum Pin
Diameter Plus
0.20 – 0.22
.007”
0.40 – 0.43
.010”
0.60 - 0.64
.013”
SPECIALS
ISO 13337 (DIN 7346) SPECIFICATIONS
Nom. Pin
Diameter
2
2.5
3
4
5
6
8
10
Expanded
Diameter
Min. Max.
2.3 2.4
2.8 2.9
3.3 3.5
4.4 4.6
5.4 5.6
6.4 6.7
8.5 8.8
10.5 10.8
Chamfer
Length
Min. Max.
0.20 0.40
0.25 0.45
0.25 0.45
0.50 0.70
0.50 0.70
0.70 0.90
0.70 0.90
0.90 1.10
Wall
Double Shear Strength
Thickness Carbon & Martensitic S.S.
Min. kN
Nominal
0.20
1.50
0.25
2.40
0.30
3.50
0.50
8.00
0.50
10.40
0.75
18.00
0.75
24.00
1.00
40.00
OTHER COMMON SPECIALS:

Special Lengths

Special Materials

Special Tolerances

Special Finishes

Special Packaging
5
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NN17 4ET United Kingdom
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08940 Cornellà de Llobregat
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Tel. +34 93 193 05 32
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No. 122 HeDan Road
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Fax. +86 21 5046 1540
Please refer to www.SPIROL.com for current specifications and standard product offerings.
4
SPIROL Application Engineers will review your application needs and work
with you to recommend the optimum solution. One way to start the process
is to visit our Optimal Application Engineering portal at SPIROL.com.
© 2016 SPIROL International Corporation 10/13 Rev. 1
SPIROL Korea
160-5 Seokchon-Dong
Songpa-gu, Seoul, 138-844, Korea
Tel. +86 (0) 21 5046-1451
Fax. +86 (0) 21 5046-1540
e-mail:
[email protected]